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what would you guys recommend to become a better headsup player?
it's one of my biggest leaks as well
€: yeh i know nash and know that i am able to play headsup sngs on stars

further clues would be nice
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At these levels I do alot of limping and trapping. Sometimes people are obvious in that they will never bet without a hand. So when they check to you, bet. Or if they check to you twice, bet.
If you flop a pair, bet to them.
If they are over aggresive like so many people are, check top pair to them and then raise them.
If you have a huge chip lead and they have less than 5 BB's. You really should put them all in with any two face cards or better. When they get to 4 BB's or less just about any two cards is good enough for a raise.